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WorkCentre C2424 Service Manual
Drum Preparation
To prepare the drum, a thin coating of silicone oil is applied to the surface of the
drum. First the drum is rotated. Next, the oil roller and blade of the drum maintenance
system are raised into contact with the drum. To accomplish this, the process drive
rotates the drum maintenance camshaft lifting the oil and wiper blade to the drum.
The cams on the ends of the camshaft push against followers on each side of the drum
maintenance system, forcing the oil roller and blade against the drum. The drum is
rotated against the oil saturated roller.
Printing
To print, the drum starts rotating at a speed dependent upon print resolution. As the
drum reaches the correct speed, the jets begin to fire to deposit the image on the oiled
portion of the drum. As the jets fire, the printhead moves from right to left to complete
the image on the drum.
When printing, the printer performs a “six-jet interlace,” in which each jet lays down a
particular number of pixel columns, depending on the print resolution. Each jet lays
down one pixel column for each drum rotation, which varies from eight to 16
rotations, depending on the print resolution. Interlacing “averages out” the variability
between jets by interlacing each jet with other jets. In some test prints, the printhead
moves to the right and lays down 309 parallel bands of ink. Each band is composed of
15 pixel columns of dots from an individual jet.
s2424-040
Drum
Maintenance Roller
Drum Maintenance Pivot Plate
Drum Maintenance
Camshaft
Blade
Oil On Drum
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